Brush of steel wire springs



Dec. 22, 1931. w. WALBRHL BRUSH oF STEEL WIRE SPRINGS Filed Oct. 7. 1929 "2 spring adapt themselves with greater same, when necessary.

Patented Dec. 22, 1931 UNETD STATS WILHELM WALBRHL, O'F COLOGNE, GERMANY BRUSH OF STEEL WIRE SPRINGS Application med october 7, 192e. serial No. 398,027.

rl`his invention relates to a brush of steel wire springs, specially designed for sweeping chimneys or for similar purposes. In brushes of this type it is common to make the brush body of several disc-shaped elements carrying the springs so that the discs of each element, having a. hole at the centre, are mounted on a common bolt and fixed on the same by means of nuts. i

Such brushes having once been finished, form not easily alterable brush bodies. In the sweeping of chimneys narrowings 0f cross section sometimes prevent the brush from passing. As brushes from steel wire ydifiiculty to narrowings of cross section, than brushes of elastic material it would be necessary to have on the spot several brush bodies with different springs to interchange the lt is disagreeable for a chimney sweep to carry along several brushes and to interchange the same, when necessary.

rEhe brush, according to the invention, consists, in a manner known per se, of steel spring elements fixed between discs having each a hole at the centre. From such brush elements brushes of different thickness can be made by mounting the desired number of t elements on a screw bolt on which they are 3 disc-like nuts.

then fixed by means of nuts. According to the invention the several elements on the screw bolt are separated by springs, preferably spiral springs, and held on the bolt by It is easy to remove some rush elements or to add other brush elements, in order to decrease or increase the elasticity of the brush. Wv ith this object in view one of the nuts is unscrewed, the brush m separated from the rope, and certain elements removed or inserted. This can be easily done on roofs.

In order to avoid the necessity to carry wrenches, the nuts are arranged so that they can be easily screwed on or off by hand.

With this object in View clearance is left between the sices of thread, preferably square thread. The ease of turning of the nuts ensured thereby is not objectionable o while using the brush, as by the spiral springs Vinserted between the brush elements a` kind 'and to the lower end ofthe chain a ball is 60 fixed, a thimble being fixed to the other end of the chain. In the sweeping of a chimney the ball is pulled rup and then allowed to drop suddently so that the brush bodies are forced through the chimney.

By the above described arrangement of spiral springs between the brush elements, the nuts are pressed apart in the longitudinal direction of the bolt. When theball is lifted as well as when it is dropped, it strikes against the nut which is thus pushed forward, against the springs, a distance equal to the clearance in the thread so that the nuts are loosened in the thread.

According to the invention the ball and the thimble are eachconnected with the corre sponding chain link by an easily removable cross pin so that the` chain can be easily detached from the ball or from the thimble. Closed connecting elements welded together cannot be used between the chain, ball and thimble, and open connecting elements like spring hooks are not sufficiently strong so that the connecting means accordinor to the invention is very practical. The thnnble is preferably made of such shape that it uniformly strikes against the corresponding nut of the brush body.

An embodiment of the invention is illustrated by way of example in the accompanying drawings in which:

Fig. l shows a chimney device.

Fig.v2 is a cross section on line 2-2 of Fig. 1 showing the thimble.

Fig. 3 shows on considerably enlarged scale parts of the screw bolt and nut.-

Fig. l shows on reduced scale the brush body.

The

brush with beating brush elements are composed of sets 100 of steel wires 1 held between discs 2, having each a hole at the centre. These sets of wires are mountedL on a tubular body 3. Each element may consist of one or several sets o f wires. The brush comprises for instance, as shown in Fig. 1, three elements each composed of sets of wires and spaced by spiral springs 4 surrounding the tubular body 3. On each end of the tubular body 3 a nut 5 is screwed.

The chain 17 extends through the nuts and the tubular body.

As shown in Fig. 3 a certain clearance exists between the sides of the threads.

The thimble 6, in the eye 7 of which a rope is to be detached, is preferably as shown in Fig. 2, of cylindrical shape. The thimble 6 has in one of its endfaces a cavity 8 designed to receive a link 9 ofthe chain. This link is secured in position by across pin 10. The cross pin is secured in its position by a ball 12 engaging with an annular groove 11 of the pin and pressed into this groove by the action of a spring 13 andscrew 14. The pin 10 can be easily pushed -out by a slight pressure exerted on one end by means of a pointed article, a nail or the like. The ball 15 is lixed on the link 16 of the chain 17 in a similar manner as the thimble is fixed on its chain link. To remove from the brush body, for instance, the setl of wires nearest the thimble, this thimble is detached from the chain 17, the brush body removed from the chain, the corresponding nut 5 unscrewed, the brush set of wires removed, the nut screwed on again, and the thimble connected with the chain.

To add another set of wires to the brush body one proceeds accordingly.

The nuts are securely held on the brush body by the pressure of the springs 4. When the sweeping brush is used, ball and thimble strike alternately against the nuts 5 so that the threads cannot clog.

A further advantage of the springs 4 is,

' that they form an elastic counter bearing for the brush elements, when these are exposed to considerable stress. The brush body can alsobe mounted on a rod and screwed on the same by a nut.

I claim 1 A brush'of steel wire springs, comprising in combination brush elements each composed of a set of wires, a tubular externally threaded body on which said elements are mounted, spiral springs between said elements and surrounding said tubular body, and anut on each end of said tubular body.

In testimony whereof I aflix my signature.

WILHELM WALBRHL. 

